Post-hole drill.



L. A. BLUE.

POST HOLE DRILL.

APPLICATION FILED JUNE 19, 19:5.

Patnted Feb. 20,1917.

2 SHEETS-SHEET 1.

L. A. BLUE.-

POST HOLE DRILL.

APPLICATION FILED lUNE19-, I915.

Patented Feb. 20,1917.-

2 SHEETS-SHEET 2.

Ll Blue p unrra LEE A. BLUE, OF LYRA, TEXAS.

POST-HOLE DRILL.

Application filed June 19, 1815.

To all whom it may concern:

Be it known that I, LEE A. BLUE, a citizen of the United States,residing at Lyra, in the county of Palo Pinto and State of Texas, haveinvented certain new and useful Improvements in Post-Hole Drills; and Ido hereby declare the following to be a full, clear. and exactdescription of the invention, such as will enable others skilled in'theart to which it appertains to lnake'and use the same.

This invention relates to new and useful improvements in post holedrills and the principal object of the invention is to provide a drilladapted for not only drilling the post holes but for the removal of theearth therefrom.

Another object of the invention is to provide a foldable drill capableof being readily placed in service and folded when not in use fortransportation.

Still another object of the invention is to provide a novel form ofbucket or sheath for the drill bit which will enable the earth to beremoved from the post hole simultaneously with the removal of the drillbit therefrom.

With these and other objects in view the invention consists in the novelcombination and arrangement of parts which will be fully set forth inthe following specification and accompanying drawings, in which Figure 1is a view in elevation of a post hole drill constructed in accordancewith this invention.

Fig. 2 is a fragmentary view in elevation and partly in section of adrill from another side.

Fig. 3 is a fragmentary top plan view showing portions broken away tomore clearly illustrate the. details of construction, an

Fig. 4 is an enlarged detail View illustrating the gearing and supporttherefor.

Fig. 5 is a bottom plan view of the sheath, and

Fig. 6 is a detail perspective view of one of the hinged doors.

Referring now to the drawings by characters of reference the numeral 1designates the supporting plate of the device comprising a disk 2 havingformed at the under side thereof, the collar 3. The disk and collar areeach formed with centrally located axially alined apertures 4, havingSpecification of Letters Patent.

Patented me. so, 1917.

Serial No. 35,136.

formed therein a series of screw threads. Pivotally connected as at 5 tothe periphery of the disk are the legs 6, which form the stand for thedrill. Extending through the screw threaded openings in the disk andcollar is a threaded drill bar or stem 7, carrying at its lower end thesocket 8 formed with the rectangular axial opening 9 in which the upperend of the drill bit sets.

Extending between two of the legs and removably secured thereto is thehorizontal bar 10 formed with a central enlargement 11 having formedtherein an opening 12, which is designed to receive and form a bearingforthe shaft 13, carrying at its outer end the hand wheel 14 havingsecured thereto, the crank arm 15. Mounted on the shaft 13 to one sideof the enlargement 11 is a suitable collar 16 which is secured to theshaft by means of a set screw. The end of the shaft opposite the handwheel 14 carries the bevel gear 17 which meshes with the gear 18 on thedrill bar or stem hereinbefore referred to. This drill bar or stem isformed with a longitudinally extending groove 19 throughout its entirelength in which the tongue 20 carried by the bevel gear 18 is slidable.

A suitable internally screw threaded collar 21 is threaded onto the stemor drill bar and extending laterally therefrom is a suitable arm 22having at its opposite end the upward extension 23, which is formed atits upper extremity with the enlargement 24 which is provided with anaperture 25 in which the shaft 13 is rotatably mounted.

The drill bit hereinbefore referred to comprises the shank or stem 26having formed at its upper end the rectangular portion 27 which is of asize to fit within the rectangular opening in the socket at the lowerend of the drill bar. At the lower end of the shank or stem 26 is formeda series of spiral blades 28 which increase in diameters until at theirlower ends theyare at their maximum width. Surrounding the stem 26 is asuitable plate 29 having extending downwardly therefrom the arms 30which are arcuate in cross section and terminate at a point above thelower end of the spiral blades. Suitable doors 31 are pivoted at thelower ends of the arms and are held in such a position that when the bitis in action, the doors will remain in their inoperative position and assoon as the bit is drawn upwardly to remove the drill from the posthole, the same will fall to their closed positions, thereby retainingthe loose earth within the sheath or guard.

It will be apparent from the foregoing that in use the hand wheel isturned, thereby driving the gears and causing the threaded drill bar orstem to revolve, thus threading the same upwardly or downwardly withinthe frame and within the cuff. It will thus be seen that the bit mayberaised or lowered according to the direction of rotation and when thedrilling operation is concluded, the wheel maybe rotated in such adirection as to raise the bit and the sheath thereby withdrawing theloose earth simultaneously with the removal of the bit from the posthole.

While in the foregoing there has been shown and described the preferredembodiment of this invention, it is to be understood that such changesmay be made in the combination and arrangement of parts as will? fallwithin the spirit and scope of the appended claims.

Whatis claimed is 1. The combination with a drill and means to operatethe drill, of a sheath carried by the drill to receive the loose earthand means carried by the sheath to lift the earth upon the withdrawal ofthe bit.

2. A post hole drill of the character described including a frame, legssupporting the frame, a drill bar threaded in the frame, means to turnthe drill bar to cause the same to move upwardly or downwardly withinthe frame, a drill bit carried by the drill bar and a sheath at thelower end of the drill bit.

3. The combination with a frame, legs supporting the frame, a drill barrotatable within the frame, said drill bar being threaded and having aslot extending throughout its entire length, a pinion mounted to slideon the drill bar, a lug eX- tending into the slot whereby when thepinion is rotated the drill bar will be moved, and means to rotate thepinion, of a drill bit at the lower end of the drill bar and a sheathsurrounding the drill bit to'lift the earth simultaneously withthe'removal of {athe drill bit from the post hole.

In testimony whereof I afiiX my signature in presence of two witnesses.

LEE BLUE.

Witnesses FRANK ELLIS, S. A. HOFFMAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, I). G.

